.container {
  width: ('70 * ($size * 0.2 + 1.5)') px;
  height: ('20 * ($size * 0.2 + 1.5)') px;
  border-radius: 5px;
  border: 1px solid rgb(0, 0, 0, 0.5);
  display: flex;
  user-select: none;
}
.shower {
  width: ('30 * ($size * 0.2 + 1.5)') px;
  height: 100%;
  border: 1px solid rgb(0, 0, 0, 0.5);
  border-top-style: none;
  border-bottom-style: none;
  font-size: 0.7rem;
}
.operator {
  width: ('20 * ($size * 0.2 + 1.5)') px;
  height: 100%;
}
.operator:active {
  background-color: rgb(0, 0, 0, 0.2);
  transition: 0.3s;
}
.center {
  display: flex;
  justify-content: center;
  align-items: center;
}
.outOfBound {
  color: red;
  border-color: red;
}
